Experimental and Numerical Evaluation of the Thermal-Fluid Characteristics of the Helium-Cooled Modular Divertor with Multiple Jets Using a Reversed Heat Flux Approach

Journal Article · Tue Apr 27 00:00:00 EDT 2021 · Fusion Science and Technology

DOI:https://doi.org/10.1080/15361055.2020.1867475· OSTI ID:1785278

Musa, S. A. ^[1]; Lee, D. S. ^[2]; Abdel-Khalik, S. I. ^[2]; Yoda, M. ^[2]

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1. Georgia Inst. of Technology, Atlanta, GA (United States); Georgia Institute of Technology
2. Georgia Inst. of Technology, Atlanta, GA (United States)

A single-finger unit of the Helium-Cooled Modular Divertor with Multiple Jets (HEMJ) with a plasma-facing surface (PFS) area of about 2 cm² has been studied in a helium (He) loop at He mass flow rates m˙_H ≤ 8 g/s and nearly prototypical conditions. Based on previous studies of the single finger of the HEMJ, our Georgia Institute of Technology group is planning to experimentally study larger divertors. Given that the HEMJ test section was heated with an induction heater and that it is impractical to scale this up to divertors with larger PFS areas, a reversed heat flux approach is being considered to measure heat transfer coefficients (HTCs). In this approach, the direction of the heat flux is reversed with water cooling and high-temperature He heating of the outer shell attached to the PFS. This work presents an initial experimental and numerical evaluation of this approach for a single HEMJ finger. Experiments with brass and copper-chromium-zirconium outer shells were conducted at dimensionless He mass flow rates or Reynolds numbers Re = 1 × 10⁴ to 4.7 × 10⁴, an inlet pressure of 10 MPa, temperatures as great as 673 K, and maximum heat flux of 8.4 MW/m². The experiments verify that the He-side HTCs are independent of the direction of the heat flux. Here, the results agree well with previous Nusselt number correlation and pressure loss coefficients for the HEMJ obtained using the normal heating approach.

• Research Organization: Georgia Tech Research Corporation, Atlanta, GA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Fusion Energy Sciences (FES)
• Grant/Contract Number: FG02-01ER54656
• OSTI ID: 1785278
• Journal Information: Fusion Science and Technology, Journal Name: Fusion Science and Technology Journal Issue: 7-8 Vol. 77; ISSN 1536-1055
• Publisher: American Nuclear Society
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
heat transfer coefficients
helium-cooled divertor
impinging jet cooling
reversed heat flux